Centerless grinder



May 22,1923.

M. O. REEVES CENTERLES S GRINDER Filed July 14 1922 2 Sheets-Sheet 1 INVENTOR v flz'lten Oifeezwea,

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'ORNEY May 22, 1923. j

' M. O. REEVES CENTERLESS GRINDER 2 Sheets-Sheet 2 Filed July 1 1922 INVENTOR Wilma Qjfee axes,

ATTORNEY Patented May 22, 1923.

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MILTON 0.,REEVES, OF COLUMBUS, INDIANA, ASSIGNOR TO REEVES PULLEY CO., 01? COLUMBUS, INDIANA, A CORPORATION OF INDIANA.

CENTERLESS GRINDER.

Original application filed May 19, 1919,

Serial No. 298,008. Divided and this application filed July 14,

1922. Serial No. 574,874.

To all whom it may concern:

Be it known that I, MILTON O. Rnnvns, a citizen of the United States, residing at Columbus, in the county of Bartholomew and State of Indiana, have invented a new and useful Centerless Grinder, of which the following is a specification. t

The object of this invention primarily is to provide improvements in details of construction of a centerless grinder by which the articles to be ground may be introduced into the grinding throat, between the grinding wheel and the feed wheel, laterally of the axis of the article to hegground, and this application, in its broadestaspect, 1s a division of my application Serial Number 298,008, filed May 19, .1919.

A further object of my invention is to so construct the work supporting bar, of an apparatus having the characteristics mentioned above, that the articles, after their introduction laterally into the grinding throat, may be automatically drlven ax ally between the grinding wheel and the feed wheel so that successive axially-spaced portions of the article will be engaged by the successive portions of length of the active face of the grinding wheel.

The accompanying drawings illustrate my invention. Fig. 1 is a front elevation of a machine embodying the fundamental characteristics of my invention; Fig. 2, a vertical section On line 22 of Fig. 1; Fig. 3, an elevation of a modified form of Work supporting bar; Fig. 4, a plan of the parts shown in Fig. 3; Fig. 5, a side elevation of another modified form of work supporting bar, and Fig. 6, a section on line 6-6 of Fig. 5.

In the drawings, 10 indicates a suitable supporting base provided with horizontal guides 11 upon which is slidingly mounted carriage 12 upon which is journaled, on a horizontal axis at right angles. to the line of movement of carriage 12, a grinding wheel 13 which, in the present instance, has a substantially cylindrical, active face. The grinding wheel 13 is driven, in the direction indicated by the arrows, at a comparatively high speed, by a suitable driving pulley 16.

Carriage 12 is adjustable by means of a.

suitable adjusting screw 17 in a common manner.

Forming part of the main frame 10 is a vertical guide 18 upon which is slidably mounted a carriage 19 readily adjustable vertically by means of an adjusting screw 20. Journalled on carriage 19, upon a substantially horizontal axis substantially at right angles to the grinding wheel 13, is a feed wheel 21 which has an active annular face. The feed wheel 21 is driven in the direction indicated by the arrows by a suitable driving train 22.

I have illustrated only one form of cooperative grinding wheel and feed wheel and do not consider that it is necessary to illustrate other forms which are now well known in the market, and it is to be understood that my present invention, to bedescribed, is applicable to the various arrangements of grinding wheel and feed wheel of such character that their cooperative effect upon work supported between them upon a suitable support, is to automatically rotate the .article to be ground, and in some instances, to also automatically drive the work axially during the grinding operation.

In order to support the article 25, which is to be ground, ll provide a work supporting bar B, which is carried by a laterallv adjustable carriage 30 and is vertically adjustable upon the carriage by any suitable means such for instance as the temper screws 37 and 41 shown in Figs. 1 and 2.

In Figs. 1 and 2, the bar B is pivoted at one end upon a horizontal pin 35 which is carried by block 36, vertically adjustable upon carriage 30 by means of the temper screw 37. At its opposite end this bar B is slotted at 38 to receive a pin 39 carried by a vertically adjustable block 40 adjusted oncarriage 30 by a temper screw 41. Pivoted on block 40 at 42 is a hand lever 43 having one end in engagement with the justable in screw 52.

uide 50 by means of a temper his end of bar B carries a pair of clips 53, 53 which are longitudinally adjustable on bar B and may be adjusted arated enough to permit any desired longitudinal movement of bar B.

At its receiving end, bar B lies in a vertical slot in the block 60 and rests normally upon a roller 61 which is vertically adjustable by means of a temper screw 62. Vertically adjustable in the block 60, by means of a temper screw 65, is a pin 66, which may be clamped in adjusted position by a nut 67. Pivoted on pin 66 is the hand lever 68, one arm of which takes under bar B so that the bar may be quickly raised and lowered a sufficient distance vertically in the throat between the grinding wheel and the feed wheel to permit the lateral introduction of the work 25 into the grinding throat.

Guides 70 and 71 are secured to the bar B and extended above the work supporting edge thereof in such way as to guide the work before entering into and after issuance from the throat between the .grinding Wheel and the feed wheel.

When the work is of such character that it may be fed into the grinding throat axially, bar B may be firmly held in proper position by means of a clamping bolt 72.

By means of the vertical adjustability of rollers 51, 61, the upper edge of bar B may be .brought to a proper vertical position where the axis of the work will be in horizontal plane with the axis of the grinding Wheel.

As is common in this art, the axis of the feed wheel is vertically adjusted to a position slightly below the axis of the grinding wheel and the axis of the workto cause it to move axially to the right, in Fig. 3, the work dropping out of the machine when it has passed the grinding wheel.

There are some forms of work, such for instance as valve stems, which are best handled by means such as a construction which is shown in Figs. 5 and 6. Here the bar B" is supported by the same construction as that shown in Fig. 3. This bar, however, is cut away at the rear end of the work supporting edge, as shown at X in Fig. 5, and the bracket is secured to the bar by bolt and-slot 81 which will permit vertical adjustment on the arm. Bracket 80 is provided with a finger 82 which overlies a portion of the upper edge of bar B" and is convenientlygrooved upon its under edge as shown at 83, the construction being such that the finger 82 can be spaced from the work supporting edge of bar B the proper distance to assist in holding the work upon the bar preliminary to its introduction into the throat of the machine.

A guide firiger 84 is supported alongside of the work, at an intermediate point in the space between bar B and. the under edge of the finger 82, by means of a retaining bolt 85 passing through a slot 86 in bracket 80.

In this form, the bar B may, if desired, be held against longitudinal movement by a clamping bolt 72, as in the other construction or, by proper separation of the clips 53, the bar B" may be left free for longitudinal movement corresponding to the desired longitudinal movement of the work relative to the grinding wheel.

Where the work to be ground is initially, axially straight, the work may be fed to the grinding throat by an axial movement along the bar, this axial movement being automatically continued by the co-action between the grinding wheel, the feed wheel, and the bar, the.work either moving along the bar and the bar remaining stationary, depending upon the shape of the work to be handled, or the work and bar moving together axially of the bar.

In many instances, espcially with work of considerable length, there is a slight crookedness (due in some instances to the unavoidable resultsof tempering) which will not be corrected by a inding action such as is described above. 11 fact, in some instances, an initial crookedness may even be accentuated by such treatment.

It is to meet this difficulty that the introduction of the work laterally into the grinding throat is made possible, and in this operation, the operator will press down upon the hand lever so as to raise the initial end of the work supporting bar to a-point where the work may be laid upon the bar adjacent the working throat. The hand lever is then raised at its outer end so that the initial end of the work supporting bar descends to its working position. During this descent, the work enters the grinding throat laterally and is simultaneously engagedfor a distance along its length equal to the width of the grinding wheel, or the full length of the Work if the work is the shorter. This dis tance is suflicient to accurately straighten an initial portion of the work, whereupon for- Ward movement of the work may be permitted in the manner already described. This forward movement may, in some instances, begin as the work is introduced laterally into the grinding throat while in other instances it may be desirable to restrain the work from forward movement until it has been reduced, at its initial end, to the desired diameter by the action of the "grinding wheel.

It will, of course, be understood by those familiar with the art, that the grinding wheel is rotated at comparatively high speed and moves downwardly toward the work supporting bar, while the feed wheel is rotated at comparatively slow speed and moves upwardly adjacent the work supporting bar, and is so adjusted, when desired, as to exert an axial forwarding effect upon the work. The precise relationship between the grinding wheel, work supporting bar and feed wheel will be dependent upon the portions of the grinding wheel and the feed wheel which are active at the grinding throat.

I claim. as my invention:

1. In a grinding machine, the combination of a feed wheel, a grinding wheel, said two wheels having working faces which converge at an intermediate point to form a grinding throat and which move past such point in opposite directions, a tiltably mounted feed bar for supporting articles to be ground in said throat and movable to move them into or out of such throat, and

" a stop on said feed bar for positioning thereon articles to be ground.

2. In a grinding machine, the combination of a, grinding wheel having a peripheral rincling face, a feed wheel having an annul ar end face, the axes of said two wheels being transverse to each other and arranged so that a point on the grinding face of the grinding wheel opposes a point on the feed face of the feed wheel to form a grinding throat between them, a feed bar for supporting articles to be ground in said grinding throat, and quick-moving mechanism for moving said feed bar to carry an article thereon into and out of said grinding throat substantially in the line of the movements of said wheels at such throat 3. In a grinding machine, the combination of a grinding wheel having a peripheral grinding face, a feed wheel having an annular endface, the axes of said two wheels being transverse to each other and arranged so that a point on the grinding face of the grinding wheel opposes a point on the feed face of the feed wheel to form a grinding throat between them, a tiltably mounted feed bar for supporting articles to be ground in said grinding throat, and means for adjusting the position of said feed bar to make its tilting movement accommodate articles of different sizes.

4. In a grinding machine, the combination of a grinding wheel having a peripheral grinding face, a feed wheel having an annular end face, the axes of said two wheels being transverse to each other and arranged so that a point on the grinding face of the grinding wheel opposes a point. on the feed face of the feed wheel to form a grinding throat between them, a feed bar for supporting articles to be ground in said grinding throat, and a stop on said feed bar for limiting the movement of articles therealong.

5. In a grinding machine, the combination of a feed wheel, a grinding wheel, said two wheels forming a grinding throat between them and having movements so that they rotate and grind an article in such grinding throat, a feed bar for supporting articles to be ground in said throat, said feed bar being movable to carry such articles laterally into and out of said grinding throat, and a stop on said feed bar for positioning thereon articles to be ground.

6. In a grinding machine, the combination of a grinding wheel having a peripheral grinding face, a feed wheel having an annular end face, the axes of said two wheels being transverse to each other and arranged so that a point on the grinding face of the grinding wheel opposes a point on the feed face of the feed wheel to form a grinding throat between them, a feed bar for supporting articles to be ground in said grinding throat, said feed bar being movable to carry such articles laterally into and out of said grinding throat, and a stop on said feed bar for limiting the-movement of articles therealong.

7 In a centerless grinder, a work support comprising a pair of vertically adjustable bar supports, a work supporting bar normallv resting on said supports, means for guiding said bar to permit lateral movement, and a lever engaging said bar for shifting said bar laterally to and from normal position.

- 8. In a centerless grinder, the combination of a grinding wheel and a feed wheel relatively arranged to form a grinding throat. a work supporting bar. mounted in said throat and mean-s for supporting said bar so that it may be laterally shifted with out disturbing the normal operative adjustments in successive normal operations from a position where the work is free from the grinding throat to a position where the work will have moved laterally into the grinding throat.

9. In a centerless grinder, the combination of a grinding wheel and a feed wheel relatively arranged to form a grinding throat, a work supporting bar mounted in said throat, and a work retainin finger overhanging said bar in the grinding throat and spaced from said bar, and a support for said bar of such character that the bar may be moved without disturbing the normal operative adjustments in normal successive operations from a position where it will support the work free from the grinding throat,

to a position where the work will have moved laterally into the grinding throat.

10. In a centerless grinder, the combina-. tion of a grinding wheel and a feed wheel relatively arranged to form a grinding throat, a work supportin bar mounted in said throat, and a Work retaining finger overhanging said bar in the grinding throat and spaced from said bar, and a. support for said bar of such character that the bar may be moved in normal successive operations from a position where it will support the work free from the grinding throat, to a position Where it will support the work in the grinding throat, the work having been moved laterally thereby into the grinding throat. I

11. In a centerless grinder, the combination of a grinding wheel and a feed wheel relatively arranged to form a grinding throat, a work supporting bar mounted in said throat, and a work retaining finger overhanging said bar in the grinding throat and spaced from said bar. r

In witness whereof, I MILTON O. REEVES have hereunto set my hand at Indianapolis, Indiana, this 8th day "of July, A. D. one thousand nine hundred and twenty-two.

MILTON O. REEVES. 

